Device and method for locking laser frequency of superfine energy-level spectrum based on two photons

Abstract

The invention relates to a stabilization technology of laser frequency, in particular discloses a device and a method for locking the laser frequency of a superfine energy-level spectrum based on two photons. According to the device and the method, disclosed by the invention, a technology that femtosecond pulse pumping is combined with continuous laser is adopted; since a femtosecond pulse can be approximately considered as a linewidth-free laser, the linewidth of a two-photon spectrum is greatly reduced at the moment, and a narrow-linewidth two-photon spectrum is obtained; the laser frequency is stabilized by utilizing a spectrum line of the narrow-linewidth two-photon spectrum, so that the stability of the laser frequency and the robustness of a system can be greatly increased; the method is simple, is extremely wide in applicability and can be used for stabilizing various different-frequency lasers of which the width is from 300nm to 1500 nm; by adopting the method, an ultrastable-frequency laser of which the stability degree is 10<-9> in one second, 10<-10> in 30 seconds and 10<-11> in 300 seconds is obtained; the whole device has the advantages of simple structure, simpleness and convenience in operation, easiness in regulation, small external interference, high stability and extremely high accuracy degree.

Description

technical field [0001] The invention relates to laser frequency stabilization technology, in particular to a laser frequency locking device and method based on two-photon hyperfine energy level spectrum. Background technique [0002] In modern society, the role of information is becoming more and more important in the military and people's daily production and life. The faster, more accurate, and richer the information is, the initiative will be mastered to take the lead in military and production and life. The laser has significant advantages in space control and time control, which makes it have a large degree of freedom in the material, shape, size and processing environment of the processing object, especially suitable for automatic processing. The laser processing system is compatible with computer numerical control technology. Combined with high-efficiency automatic processing equipment, the emergence of lasers has triggered an information revolution. From VCD, DVD dis...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems that the existing stabilization technology using atomic and molecular spectrum lasers is susceptible to the Doppler effect generated by atomic motion and the natural linewidth of the acting laser affects the linewidth of the two-photon spectrum, so that the frequency stabilization effect of the laser is reduced. , using the combination of femtosecond pulse pumping and continuous laser to obtain narrow linewidth two-photon transition spectral lines, providing a laser frequency locking device and method based on two-photon hyperfine energy level spectroscopy

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